Source: “Winning Play in Contract Bridge”
Whenever your partner has doubled a final contract in either no-trump or a slam and you are on lead, his double commands you to make a specifically prescribed, conventional lead. In these situations, your judgment concerning what you would like to lead is superseded by what partner has commanded you to lead.
Here are these conventional leads:
a) When neither you nor partner has bid, a double of final no trump contract by partner demands that you lead the first suit bid by dummy.
b) When your partner has doubled a final contract in no trump and he has bid a suit, his double is an inviolable command to you to lead his suit.
c) When your partner has doubled a final contract in no trump and you have bid a suit, his double is an inviolable command to you to lead your suit.
d) If both you and your partner have bid, and the opponents arrive at a no trump contract, which your partner doubles, your opening lead becomes a matter of judgment.
There is no accepted convention to cover this one specific situation.
e) When your partner has doubled a slam contract, whether you or he (or both of you) have or have not bid, it is an accepted convention that his double commands the lead of the first suit bid dummy.
Dealer North. E/W VUL
A Q J 8 4
Q 10 3 2
|J 10 8 7 5 4 3
6 5 3 2
|A Q 9
Q 10 7 6 4 2
A K 8 3
A K J 9 8 5
Opening lead: 9
West made the normal opening lead ofthe nine of hearts, dummys’s J was put up, East covered with the queen, and South won the trick with his king.
The A was the led, followed by another trump to dummy’s queen, picking up the adverse trumps. Now came the 5, East played the 6, and South put in the eight, knowing it would win (East’s opening lead of 9 had marked the ten as being in the East hand).
Next came the A, upon which the board’s two of spades was descarded. Declarer’s fourth heart was then trumped in dummy, and this position was arrived at:
A Q J 8 4
|J 10 8
6 5 3 2
10 7 4
K J 9 8
The K was now led, East`s ace winning and East had just become the victim of an end play! If he led either a spade or a heart, declarer would discard his nine of diamonds while simultaneously trumping the trick in dummy. And, if East chose to lead a diamond (at gun point) declarer would obtain a free finesse.
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